Improved desk and seat



R. GRUIKSHANK.`

. DESK AND SEAT.. No.7- 75,379.

PatentedA Mgr. 10, 1868.A

m-leggeg t w; Nonms PETERS cu. mman-m0,. wnsnmcw. n. c.

UNITED STMESv PATENT OFFICE.

ROBERT CRUIKSHANK, OF LAWRENCEVILLE, NEW JERSEY.

IMPRoVl-:D oeste AND SEAT.

Specification forming part of LettersPatent No. 75,379, dated March 10, 186B.

. Figure 1 is avertical section of my improved y desk, taken through the line w Fig. 2. Fig.

2 is a rear view ofthe saine. l

Similar letters of reference indicate corr sponding parts.

My invention has for its object to improve the construction of my school-desk patented May 24, 1864, and numbered 42,8759, so as to make it more convenient and satisfactory in use; and it consists in the construction and combination of the Various parts, as hereinafter more fully described.

A are the end frames of the desk, which are made of cast-iron, are screwed fast to the floor in the ordinary manner, and are strengthened with inclined braces a', The upper edges of the end frames, A, are cast in eovetailed form,

so as to enter dovetailed grooves formed in .the

under side of the top B of the desk, as shown in Fig. 2. v'By this-manner of attachment the said top B is securely attached to the frames A, and at thesame time can move upon said frames asit contracts and expands, thus guarding against the warping and splitting of said top by said contractions and expansions.

C is the seat, which is pivoted to andbetween angular or curved projections of t-he forward parts ofthe frames A.

D are curved arms, the upper ends of which are'pivoted to the forward part of the under side of the seat C, and the lower ends of which larepivoted to sliding` blocks E, which slide horizontally upon horizontal guide-rods F, secured to ears formed upon the inner sides of the frames A. The curve of the arms or bars D, is immaterial so long as its pivoting-points remain in the sa'me relative position, and so long as the said. curve is sufficient to prevent the middle part of the said arms from striking against the lower edge of the seat C when the said seat is turned up into the position shown in redin Fig. l.

Gare rubber blocksor equivalent springs.l placed upon or at the rear part of the guide? rods F, against'which the sliding blocks E strike both when the seat is lowered into a.

horizontal' position and when it is raised into a vertical position. piace the spring G in the exact point where the sliding block E will strike against it beth when the seat C is in a vertical and when in a horizontal position. lBy this arrange-nien'ttwo objects are effected: first, the seat is raised and lowered without noise, which is a very important` consideration in a school-room;

and, second', the seat C is made a spring-seat,

making it more easy and comfortable for the pupils.

1f desired, the guide-rod F, sliding block E, and spring G may be'eonneetedwith the under side of the seat C, instead of being connected with the end frames, A; as hereinbefore g described. l

Having' describedmy' invention, I claim as new and desire to secure by Letters Patentw 1. Connecting the .lower end of a curvedv arm, 1),. with the end frames, A, by means of :sliding blocks E and horizontal guide-rods F, substantially as herein show/n and described,

.and for the purpose set forth..

. 2. The combination of the rubber block G or equivalent spring with the guide-rod F andv with the sliding block E, said spring or rubber block being placed in such a position that the said sliding. block will strike against it both when the seat G is in a horizontal and when rin a vertical position.

- 8. The supporting end pieces, A, when cast with dovetailed upperendsadapted to iit into corresponding grooves for-med in the under side of theI top B of the desk, as herein shown and described, for the purpose specified.

The above specification' of my invention signed by me this 30th day of January, 1868.

ROBERT oRUIKsHANK.

\ Witnesses:

J AMES T. GRAHAM, ALEX. F. ROBERTS.

Care must be taken to 

